Free Online Spreadsheet Cleaner
Whatever's in your spreadsheet, Clean That Sheet helps you get your sheet together. One upload, one cleanup, one download.
Catch issues before they turn into a resend, failed import, or a question you have to answer later.
Upload your spreadsheet once. Clean That Sheet checks for messy spreadsheet data and other common cleanup problems, then shows you a free preview before anything is changed.
Free preview first. Full cleanup only if it helps.
Upload your file to see an issue summary, duplicate groups, blank rows, sample cleaned rows, and cleanup notes. If the preview looks useful, unlock the full cleaned file and change report for $4.99.
Drag & drop your file or screenshot, or browse
Accepts .xlsx, .xls, .csv, .png, .jpg, and .pdf · up to 50 MB
Tip: upload the actual spreadsheet file, not Excel temporary files that start with ~$.
Free scan + cleaned sample. No charge to preview.
No signup. Original file unchanged. View Trust & File Handling
On mobile, screenshots and CSVs work best. Larger Excel files are easier from desktop.
Not ready to upload? See a Sample Cleanup
Built for
Built for business professionals cleaning real spreadsheet messes.
Clean That Sheet is made for analysts, bookkeepers, admins, operators, founders, finance teams, and spreadsheet-heavy professionals who need to clean files before sending, importing, merging, or reporting.
- Analysts
- Bookkeepers
- Admins
- Operators
- Founders
- Finance teams
- Spreadsheet-heavy workflows
You do not need to choose the perfect tool first. Upload your Excel or CSV file, review what CTS finds, and unlock only when you are ready.
CTS can also check for duplicate rows, blank rows, spacing issues, inconsistent formatting, messy headers, date cleanup, imported-data problems, and more.
Not sure what your file needs? See everything CTS can check.
How Clean That Sheet works
A finished file, not a conversation. General AI tools can help you think through a spreadsheet problem. Clean That Sheet is built to help you finish the urgent, repeatable cleanup job.
- Step 1
Upload
Drop in a CSV, Excel file, screenshot, or PDF.
- Step 2
Preview
See exactly what we found before you pay.
- Step 3
Download
Unlock the finished file when it looks right.
Preview before you pay
How a general chat tool compares to Clean That Sheet for the same cleanup job.
With a chat tool
With Clean That Sheet
Explain the problem and write prompts
Upload the file
Clarify what should be cleaned
Preview the cleanup
Check whether the output is usable
Download the finished spreadsheet
Figure out what changed
Get a Change Report
No prompts. No back-and-forth. Get your file ready before you import, merge, send, or submit it.
What Clean That Sheet actually does
Built for messy real-world files. If it has data in it, there is a good chance we can help.
Supported files
- Excel files (.xlsx, .xls)
- CSV exports
- Screenshots (.png, .jpg)
- PDF report tables
Common cleanup outcomes
- Duplicate rows removed or flagged
- Blank rows and empty columns cleared
- Dates and number formats standardized
- Extra spaces and casing cleaned up
- Invalid emails and obvious errors flagged
- Original structure and headers preserved
- Preview flags messy cells before payment.
- Duplicates, blanks, formatting issues, and invalid emails are easier to spot.
- You decide whether the cleanup is worth unlocking.
- Tested on messy exports, contact lists, transaction sheets, and screenshot cleanups.
Spreadsheets are how the world actually runs, customer lists, vendor sheets, inventory, sales pipelines, survey results, recruiting trackers, side project budgets, the data behind every monthly report. And every single one of them gets messy. People type things slightly differently. Exports come in inconsistent formats. Rows get duplicated. Empty rows multiply. By the time you actually need to use the file, it needs an hour of cleanup first.
Clean That Sheet is the universal cleanup step. Upload any .csv, .xlsx, or .xls file and we'll handle the predictable mess: duplicate and near duplicate rows, leading and trailing whitespace, inconsistent casing on names and emails, mixed date formats, empty rows, and messy column headers. The output is the same file, just usable.
It's built for non technical users on purpose. There's no formula to write, no macro to debug, no Python script to maintain, no "connect your data warehouse" wizard. You drop in a file, you see a free preview, you pay only if it looks right, and you download a clean version. That's the whole product.
If you clean spreadsheets a few times a month, exporting customer data before a campaign, prepping a vendor list before an import, deduping a survey response file, cleaning up a CRM export before handing it to a teammate, this is the tool we wish existed when we were doing the same thing by hand. Bring your messiest sheet. It'll be fine.
Want cleaner files with less work?
Get occasional updates as Clean That Sheet adds more ways to fix messy spreadsheets.